Actor seen swirling round front of cinema -- bless! (10)
I believe the answer is:
consecrate
'bless' is the definition.
('consecrate' can be a synonym of 'bless')
'actor seen swirling round front of cinema' is the wordplay.
'swirling' indicates anagramming the letters.
'round' is an insertion indicator.
'front of' suggests taking the first letters.
The initial letter of 'cinema' is 'c'.
'actor'+'seen'='actorseen'
'actorseen' with letters rearranged gives 'conserate'.
'conserate' enclosing 'c' is 'CONSECRATE'.
(Other definitions for consecrate that I've seen before include "giving cause to be respected" , "Make holy" , "Make 18 [SACRED]" , "Sanctify" , "Bless" .)