A lefty with a cold in shot (5)
I believe the answer is:
raced
'shot' is the definition.
(I've seen this in another clue)
'a lefty with a cold' is the wordplay.
'a lefty' becomes 'red' (I've seen this before).
'with' is an insertion indicator.
'cold' becomes 'c' (eg on taps).
'a'+'c'='ac'
'red' enclosing 'ac' is 'RACED'.
'in' is the link.
(Other definitions for raced that I've seen before include "speeded" , "Cedar (anag)" , "Took part in speed contest" , "Took part in competition of speed" , "Dashed" .)