Old US President amongst quintet in shot (3,5)
I believe the answer is:
off drive
'shot' is the definition.
(type of cricket shot)
'old us president amongst quintet' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'us president' becomes 'fdr' (Franklin Delano Roosevelt).
'amongst' means one lot of letters goes inside another (I've seen this in other clues).
'quintet' becomes 'five' ('five' can be a synonym of 'quintet').
'fdr' put within 'five' is 'ffdrive'.
'o'+'ffdrive'='OFF-DRIVE'
'in' is the link.
(Other definitions for off drive that I've seen before include "One sent to cover" , "Stroke of a cricketer" .)