Post pinmen to Pat perhaps (11)
I believe the answer is:
appointment
'post' is the definition.
(I've seen this before)
'pinmen to pat perhaps' is the wordplay.
'perhaps' indicates an anagram.
'pinmen'+'to'+'pat'='pinmentopat'
'pinmentopat' with letters rearranged gives 'APPOINTMENT'.
(Other definitions for appointment that I've seen before include "German city" , "Post" , "Meeting" , "Engagement" , "Date" .)