Again urge to answer (5)

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'to answer' is the definition.
('reply' can be a synonym of 'answer')

'again urge' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'urge' becomes 'ply' (I can't justify this - if you can you should give a lot more credence to this answer).
're'+'ply'='REPLY'

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(Other definitions for reply that I've seen before include "Reciprocate" , "acknowledgement" , "Come back" , "Counter" , "Return" .)

I've seen this clue in The Irish Independent.

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