Rouse the fiery Celt perhaps (9)
I believe the answer is:
electrify
'rouse' is the definition.
(I know that electrify is a more specific form of the action rouse)
'fiery celt perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'fiery'+'celt'='fierycelt'
'fierycelt' is an anagram of 'ELECTRIFY'.
'the' is the link.
(Other definitions for electrify that I've seen before include "Galvanise - animate" , "Excite intensely" , "Fire" , "Charge with power" , "Supply power to; shock, thrill" .)