Pleasant to welcome English relative (5)
I believe the answer is:
niece
'relative' is the definition.
(niece is a kind of relative)
'pleasant to welcome english' is the wordplay.
'pleasant' becomes 'nice' ('nice' is associated in meaning with 'pleasant').
'to welcome' is an insertion indicator (in sense of 'inviting in').
'english' becomes 'e' (abbreviation).
'nice' placed around 'e' is 'NIECE'.
(Other definitions for niece that I've seen before include "Young female relative" , "A younger female relative" , "[PRIEST'S] daughter?" , "Son's cousin" , "girl further down the line" .)