Needlework more than enough to occupy sister (7)
I believe the answer is:
sampler
'needlework' is the definition.
(I know that sampler is a type of embroidery)
'more than enough to occupy sister' is the wordplay.
'more than enough' becomes 'ample' (I've seen this before).
'to occupy' is an insertion indicator (inserted letters occupy or enter the word).
'sister' becomes 'sr' (abbreviation as in names of nuns).
'ample' placed into 'sr' is 'SAMPLER'.
(Other definitions for sampler that I've seen before include "recording of representative items" , "Embroidered specimen piece" , "Piece of embroidery showing skilled needlework" , "Piece of embroidery done as exercise" , "Piece of embroidery showing skill in needlework" .)