Admit, recognise (11)
I believe the answer is:
acknowledge
I believe this clue is a double definition.
'admit' is the first definition.
(I know that admit can be written as acknowledge)
'recognise' is the second definition.
(synonyms)
(Other definitions for acknowledge that I've seen before include "Express thanks for" , "Admit the truth of (something)" , "Admit - recognise - thank" , "Show recognition of" , "Confirm (receipt)" .)