Small bag of pennies, etc, OK for change (6)
I believe the answer is:
'small bag' is the definition.
(small bag attached to clothing)
'pennies etc ok for change' is the wordplay.
'pennies' becomes 'p' (abbreviation for pence).
'for change' indicates anagramming the letters (I've seen this in other clues).
'etc'+'ok'='etcok'
'etcok' with letters rearranged gives 'ocket'.
'p'+'ocket'='POCKET'
'of' is the link.
(Other definitions for pocket that I've seen before include "Appropriate" , "Take for oneself" , "Pot a snooker ball into the ....." , "Snooker table hole" , "Take dishonestly; pouch" .)