Present source (5)

I believe the answer is:

giver

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'present source' is the definition.
(I've seen this before)

'present source' is the wordplay.
'present' becomes 'give' (synonyms).
'source' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'give'+'r'='GIVER'

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(Other definitions for giver that I've seen before include "Donor" , "presenter" , "Bestower" , "Present source" .)

I've seen this clue in The Globe and Mail.

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