The most common and most likely answer to this crossword clue is the 5 letter word PERCH
P
E
R
C
H
Buddy explains!

The straight part
We know that "pew" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pew = perch.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PERCH mean?
PERCH noun- Any of the three species of spiny-finned freshwater fish in the genus Perca.
- Any of the about 200 related species of fish in the taxonomic family Percidae, especially:
- Several similar species in the order Perciformes, such as the grouper.
- A rod, staff, or branch of a tree etc used as a roost by a bird
- A pole connecting the fore gear and hind gear of a spring carriage; a reach.
- A position that is secure and advantageous, especially one which is prominent or elevated
- A position that is overly elevated or haughty
- A linear measure of 5 1/2 yards, equal to a rod, a pole or 1/4 chain; the related square measure
- A cubic measure of stonework equal to 16.6 × 1.5 × 1 feet
- A frame used to examine cloth
- A bar used to support a candle (especially in a church)
- Any of the three species of spiny-finned freshwater fish in the genus Perca.
- Any of the about 200 related species of fish in the taxonomic family Percidae, especially:
- Several similar species in the order Perciformes, such as the grouper.
- A rod, staff, or branch of a tree etc used as a roost by a bird
- A pole connecting the fore gear and hind gear of a spring carriage; a reach.
- A position that is secure and advantageous, especially one which is prominent or elevated
- A position that is overly elevated or haughty
- A linear measure of 5 1/2 yards, equal to a rod, a pole or 1/4 chain; the related square measure
- A cubic measure of stonework equal to 16.6 × 1.5 × 1 feet
- A frame used to examine cloth
- A bar used to support a candle (especially in a church)
- To rest on (or as if on) a perch; to roost.
- To stay in an elevated position.
- To place something on (or as if on) a perch.
- To inspect cloth using a perch.