I am seen in unusual anger but recover possession (6)
I believe the answer is:
regain
'recover possession' is the definition.
'regain' can be an answer for 'recover' (synonyms). I am not sure about the 'possession' bit.
'i am seen in unusual anger' is the wordplay.
I cannot really understand how this works, but
'i' could be 'a' and 'a' is present in the answer.
'in' is found in the answer.
The remaining letters 'reg' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'but' acts as a link.
Can you help me to learn more?
(Other definitions for regain that I've seen before include "Recover - in gear (anag)" , "Get back, recover the use of" , "Get back (previously owned object)" , "Recover, retrieve" , "Win back" .)