Its recipient will have a lot on his plate (5,7)

I believe the answer is:

large portion

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'its recipient will have a lot on his plate' is the definition.
The definition suggests a singular noun which matches the answer.

'lot on his plate' is the wordplay.
'lot' becomes 'portion' (synonyms).
'on' says to put letters next to each other.
'his plate' becomes 'large' (I can't explain this - if you can you should believe this answer much more).
'portion' put after 'large' is 'LARGE PORTION'.

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

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