Hack possibly putting run in stockings? (5)
I believe the answer is:
horse
'hack possibly' is the definition.
(hack is a kind of horse)
'run in stockings?' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'in' is an insertion indicator.
'stockings?' becomes 'hose' (I've seen this in other clues).
'r' inserted inside 'hose' is 'HORSE'.
'putting' is the link.
(Other definitions for horse that I've seen before include "farm animal" , "Vaulting apparatus" , "It may get people stoned" , "Roan" , "Cavalry - gymnastic apparatus" .)