Ex has power: love is renewed and fiery (9)
I believe the answer is:
explosive
'fiery' is the definition.
(I've seen this before)
'ex has power love is renewed' is the wordplay.
'has' says to put letters next to each other.
'power' becomes 'p' (symbol in physics).
'renewed' indicates an anagram.
'love'+'is'='loveis'
'loveis' with letters rearranged gives 'losive'.
'ex'+'p'+'losive'='EXPLOSIVE'
'and' acts as a link.
(Other definitions for explosive that I've seen before include "highly dangerous" , "Likely to blow up" , "Likely to cause anger or controversy" , "Likely to shatter or burst apart" , "Volatile" .)