Dirty frame amongst frames of gallery? (5)
I believe the answer is:
grimy
'dirty' is the definition.
(similar in meaning)
'frame amongst frames of gallery?' is the wordplay.
'frame' becomes 'rim' (I've seen this in another clue).
'amongst' indicates putting letters inside (I've seen this in other clues).
'frames of' suggests removing the centre (I've seen 'frame of' mean this (use the outside letters which frame the word)).
'gallery' with its centre removed is 'gy'.
'rim' placed into 'gy' is 'GRIMY'.
(Other definitions for grimy that I've seen before include "smutty" , "filthy" , "Mucky" , "Ingrained with dirt" , "grunge" .)