Alluring companion exciting Mairi's cat (11)
I believe the answer is:
charismatic
'alluring' is the definition.
(thesaurus)
'companion exciting mairi's cat' is the wordplay.
'companion' becomes 'ch' (Companion of Honour).
'exciting' is an anagram indicator.
'mairis'+'cat'='mairiscat'
'mairiscat' is an anagram of 'arismatic'.
'ch'+'arismatic'='CHARISMATIC'
(Other definitions for charismatic that I've seen before include "Inspirational in personality" , "having a strong pull" , "inspiring devotion" , "Having strongly attractive personal power" , "Charming" .)