Observe attack and think it right (3,3)
I believe the answer is:
see fit
'think it right' is the definition.
(I've seen this in another clue)
'observe attack' is the wordplay.
'observe' becomes 'see' (I've seen this before).
'attack' becomes 'fit' (fit is a kind of attack).
'see'+'fit'='SEE FIT'
'and' is the link.
(Other definitions for see fit that I've seen before include "Consider suitable" , "Think suitable" , "Consider appropriate or choose to do" , "Consider to be proper or desirable" , "Consider appropriate, decide to do" .)