Special strategy game mostly involves me in plans (7)
I believe the answer is:
schemes
'plans' is the definition.
(scheme is a kind of plan)
'special strategy game mostly involves me' is the wordplay.
'special' becomes 'S' (common abbreviation as in Special Air Service).
'strategy game' becomes 'chess' (chess is a game of strategy).
'mostly' means to remove the last letter.
'involves' is an insertion indicator.
'chess' with its final letter taken away is 'ches'.
'ches' placed around 'me' is 'chemes'.
's'+'chemes'='SCHEMES'
'in' is the link.
(Other definitions for schemes that I've seen before include "''The best-laid ... o' mice an' men Gang aft a-gley''" , "Plans, plots, projects" .)