Aid ship orca damaged, which arouses those chasing it (11)
I believe the answer is:
aphrodisiac
'which arouses those chasing it' is the definition.
(an aphrodisiac arouses people for sex or 'it')
'aid ship orca damaged' is the wordplay.
'damaged' indicates anagramming the letters.
'aid'+'ship'+'orca'='aidshiporca'
'aidshiporca' with letters rearranged gives 'APHRODISIAC'.
(Other definitions for aphrodisiac that I've seen before include "Substance exciting sexual desire" , "Food or drink stimulating desire" , "Something that stimulates desire" , "Exciting drug" , "Substance or activity stimulating carnal desire" .)