City area in Northern Ireland originally enticing family member (5)
I believe the answer is:
niece
'family member' is the definition.
(I've seen this before)
'city area in northern ireland originally enticing' is the wordplay.
'city area' becomes 'ec' (EC is a London postcode area).
'in' indicates putting letters inside.
'northern ireland' becomes 'ni'.
'originally' suggests taking the first letters.
The first letter of 'enticing' is 'e'.
'ni'+'e'='nie'
'ec' going inside 'nie' is 'NIECE'.
(Other definitions for niece that I've seen before include "[PRIEST'S] daughter?" , "Son's cousin" , "A sibling's child" , "Female family member" , "Brother or sister's daughter" .)