Crossword Genius

Join fool in backing European Union (5)

Ross

I believe the answer is:

unite

'join' is the definition.
('unite' can be a synonym of 'join')

'fool in backing european union' is the wordplay.
'fool' becomes 'nit' (I've seen this before).
'in' indicates putting letters inside.
'backing' says the letters should be written in reverse.
'european union' becomes 'eu'.
'eu' back-to-front is 'ue'.
'nit' inserted into 'ue' is 'UNITE'.

(Other definitions for unite that I've seen before include "Link" , "Club together" , "Join together, become allies" , "Group of workers" , "ally" .)

I've seen this clue in The Telegraph.
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