Unusually lucky, he’s accommodating single shrub (11)
I believe the answer is:
honeysuckle
'shrub' is the definition.
(honeysuckle is a kind of shrub)
'unusually lucky he's accommodating single' is the wordplay.
'unusually' indicates an anagram.
'accommodating' means one lot of letters goes inside another.
'single' becomes 'one' (a single thing - only one).
'lucky'+'hes'='luckyhes'
'luckyhes' is an anagram of 'hysuckle'.
'hysuckle' enclosing 'one' is 'HONEYSUCKLE'.
(Other definitions for honeysuckle that I've seen before include "Fragrant flowering climber" , "Fats's bloomer introducing Rose" , "Climbing plant" , "Climbing shrub" , "Fragrant vine" .)