Mob were out to enclose (7)
I believe the answer is:
embower
'enclose' is the definition.
(embowering is a kind of enclosing)
'mob were out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'mob'+'were'='mobwere'
'mobwere' anagrammed gives 'EMBOWER'.
'to' is the link.
(Other definitions for embower that I've seen before include "Surround, enclose" , "Give shelter" , "Put in leafy recess" , "Introduce to the Hollies perhaps" .)