Try gates as tactics have changed (8)
I believe the answer is:
strategy
'tactics have changed' is the definition.
I can't judge whether this definition defines the answer.
'try gates' is the wordplay.
'try gates' can be anagrammed to 'STRATEGY'.
However, I'm not clear how the anagram is indicated.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for strategy that I've seen before include "Get satyr to formulate tactics" , "Game plan" , "manoeuvres" , "Systematic plan of action" , "Overall plan for campaign" .)