Little time at present for little fish (6)
I believe the answer is:
minnow
'little fish' is the definition.
(I've seen this in another clue)
'little time at present' is the wordplay.
'little time' becomes 'min' (short for minute).
'at present' becomes 'now' (synonyms).
'min'+'now'='MINNOW'
'for' is the link.
(Other definitions for minnow that I've seen before include "A fish; insignificant person" , "Little person" , "Tiny freshwater fish" , "Very little fish" , "Tiddler" .)