The most common and most likely answer to this crossword clue is the 5 plus 4 letter word SMALL ARMS
S
M
A
L
L
A
R
M
S
More clues leading to the result SMALL ARMS
- Weaponry General Thumb was never without?
- What little kids have as weapons
- Weapons that don’t reach very far?
- Some dinosaurs had these weapons
- Such weapons as come shortly to hand?
- T. Rex had such lightweight pieces
- Little heraldic symbols on weapons
- Petty saint stealing power revolvers
- Weapons that babies have
Buddy explains!

The straight part
We know that "lightweight pieces" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lightweight pieces = small arms.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.