Beat time to welcome Rugby School skipper? (6)
I believe the answer is:
truant
'school skipper?' is the definition.
(I've seen this before)
'beat time to welcome rugby' is the wordplay.
'beat' becomes 'tan' (I've seen this before).
'time' becomes 't' (abbreviation).
'to welcome' is an insertion indicator (in sense of 'inviting in').
'rugby' becomes 'RU'.
'tan'+'t'='tant'
'tant' enclosing 'ru' is 'TRUANT'.
(Other definitions for truant that I've seen before include "Kid bunking off school" , "One cutting school" , "Schoolboy who dodges school attendance" , "Pupil skipping school" , "Academic absentee" .)