Look after small personal problem for careless shepherd (6,2,4)
I believe the answer is:
little bo peep
'careless shepherd' is the definition.
(nursery rhyme character)
'look after small personal problem' is the wordplay.
'look' becomes 'peep' (peep can mean to look at something).
'after' means one lot of letters go next to another.
'small' becomes 'little' (synonyms).
'personal problem' becomes 'bo' (informal abbreviation for body odour).
'little'+'bo'='littlebo'
'peep' after 'littlebo' is 'LITTLE BO-PEEP'.
'for' acts as a link.
(Other definitions for little bo peep that I've seen before include "Guardian 3 [OF THE LAMBS]" , "Nursery rhyme shepherdess" , "Careless shepherdess?" , "Careless girl" , "A remiss shepherdess" .)