Christen bachelor and sip tea perhaps (7)
I believe the answer is:
baptise
'christen' is the definition.
(synonyms)
'bachelor and sip tea perhaps' is the wordplay.
'bachelor' becomes 'B' (abbreviation e.g. BA=Bachelor of Arts).
'and' says to put letters next to each other.
'perhaps' indicates anagramming the letters.
'sip'+'tea'='siptea'
'siptea' is an anagram of 'aptise'.
'b'+'aptise'='BAPTISE'
(Other definitions for baptise that I've seen before include "Give name" , "Administer the first RC sacrament" , "Christen" , "First Roman Catholic sacrament" .)