Specially nice mashed tater? (5)

I believe the answer is:

treat

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'specially nice' is the definition.
I can't tell whether this defines the answer.

'mashed tater?' is the wordplay.
'mashed' indicates anagramming the letters.
'tater' with letters rearranged gives 'TREAT'.

Can you help me to learn more?

(Other definitions for treat that I've seen before include "Pay for - minister to - deal with" , "Negotiate to reach an agreement" , "Unexpected surprise" , "Handle - delightful surprise" , "Enjoyable surprise gift" .)

I've seen this clue in the Evening Standard.

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