Tactics, seeing homeless cat get back in (8)
I believe the answer is:
strategy
'tactics' is the definition.
(I've seen this before)
'homeless cat get back in' is the wordplay.
'homeless cat' becomes 'stray' (I've seen this before).
'back' says the letters should be written backwards.
'in' indicates putting letters inside.
'get' back-to-front is 'teg'.
'stray' going around 'teg' is 'STRATEGY'.
'seeing' is the link.
(Other definitions for strategy that I've seen before include "Art of military planning" , "manoeuvres" , "Overall plan for campaign" , "Get satyr to formulate tactics" , "Plan or policy as for conducting campaign" .)