Some late trading will get you fish (5)
I believe the answer is:
tetra
'fish' is the definition.
(tetra is a kind of fish)
'some late trading' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'TETRA' can be found hidden inside 'late trading'.
'will get you' is the link.
(Other definitions for tetra that I've seen before include "Small brightly-coloured fish of aquariums" , "Accosting and detaining (someone)" , "Wrongful act (Law)" , "Denoting four (prefix)" , "starter for four" .)