Roam around to obtain backing for plan (8)
I believe the answer is:
strategy
'plan' is the definition.
(strategy is a kind of plan)
'roam around to obtain backing' is the wordplay.
'roam' becomes 'stray' ('stray' can be a synonym of 'roam'**).
'around' is an insertion indicator.
'to obtain' becomes 'get' ('get' can be a synonym of 'obtain').
'backing' says the letters should be written backwards.
'get' reversed gives 'teg'.
'stray' enclosing 'teg' is 'STRATEGY'.
'for' is the link.
(Other definitions for strategy that I've seen before include "Grand design" , "Plan or policy to achieve something" , "Approach" , "Get satyr to formulate tactics" , "Scheme" .)