More than one union faction's infiltrated by journalist beginning to delve (8)
I believe the answer is:
weddings
'more than one union' is the definition.
I can't tell whether this definition defines the answer.
'faction's infiltrated by journalist beginning to delve' is the wordplay.
'faction's' becomes 'wings' (a group within an organisation).
'infiltrated by' indicates putting letters inside.
'journalist' becomes 'ed' (short for editor).
'beginning to' suggests taking the first letters.
The first letter of 'delve' is 'd'.
'ed'+'d'='edd'
'wings' going around 'edd' is 'WEDDINGS'.
Can you help me to learn more?
(Other definitions for weddings that I've seen before include "Marriage ceremonies" , "Marriages" , "Nuptial ceremonies" , "Matches" .)