Behind, holding further set of baby clothes (7)
I believe the answer is:
layette
'set of baby clothes' is the definition.
(I've seen this before)
'behind holding further' is the wordplay.
'behind' becomes 'late' (as in behind schedule).
'holding' means one lot of letters goes inside another.
'further' becomes 'yet' (I've seen this in another clue).
'late' enclosing 'yet' is 'LAYETTE'.
(Other definitions for layette that I've seen before include "Kit for baby" , "baby needs this" , "small outfit" , "Accessories for new baby" , "Complete set of clothing for a baby" .)