The most common and most likely answer to this crossword clue is the 5 letter word SHEEN
I've seen this crossword clue in The Guardian
S
H
E
E
N
More clues leading to the result SHEEN
- Female in from France provides lustre
- Radiance noticed around husband
- Lustre perceived when heroin's injected
- Polish mum once called round
- Polish husband spotted outside
- Slick Blair seen on TV
- Brilliance of healthcare provider in recession without drugs
- Lustre noticed when touring hotel
- Radiance observed when one’s lit up?
- Member of acting family observed when drunk
Buddy explains!

The straight part
We know that "Polish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case polish = sheen.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 SHEEN mean?
SHEEN noun- Splendor; radiance; shininess.
- A thin layer of a substance (such as oil) spread on a solid or liquid surface.
- To shine; to glisten.
- Beautiful, good-looking, attractive; radiant; shiny.
- The letter ش in the Arabic script.