Fit in pieces of bacon for meal (7)
I believe the answer is:
conform
'fit in' is the definition.
(thesaurus)
'pieces of bacon for meal' is the wordplay.
'pieces of' indicates a hidden word (I've seen 'piece' mean this).
'CONFORM' is hidden in the letters of 'bacon for meal'.
(Other definitions for conform that I've seen before include "Follow the crowd" , "become fitter?" , "Toe the line" , "Fall into line" , "Follow the herd" .)