Storm to adopt extreme approach (6)
I believe the answer is:
attack
'storm' is the definition.
(I know this)
'adopt extreme approach' is the wordplay.
'extreme' suggests removing the centre.
'approach' becomes 'tack' (I've seen this in another clue).
'adopt' with its centre taken out is 'at'.
'at'+'tack'='ATTACK'
'to' acts as a link.
(Other definitions for attack that I've seen before include "An assault or onslaught" , "Invade; vilify" , "Offensive or inslaught" , "Forward line" , "Assault, offensive" .)