Queen under pressure to contact evangelist (8)
I believe the answer is:
preacher
'evangelist' is the definition.
(I've seen this before)
'queen under pressure to contact' is the wordplay.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'under' means one lot of letters go next to another.
'pressure' becomes 'p' (abbreviation).
'to contact' becomes 'reach' ('reach' can be a synonym of 'contact').
'p'+'reach'='preach'
'er' put after 'preach' is 'PREACHER'.
(Other definitions for preacher that I've seen before include "Religious minister" , "evangelist found" , "One spreading religious message" , "Gospeller" , "One spreads the message" .)