Crossword Genius

Unsatisfactory postman quickly recalled? (3,3)

Ross

I believe the answer is:

off pat

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'quickly recalled?' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'unsatisfactory postman' is the wordplay.
'unsatisfactory' becomes 'off' (similar in meaning).
'postman' becomes 'pat' (children's TV character Postman Pat).
'off'+'pat'='OFF PAT'

Can you help me to learn more?

(Other definitions for off pat that I've seen before include "Perfectly memorised" , "Fluent" , "Faithfully retained" , "Recalled perfectly" , "exactly recalled" .)

I've seen this clue in The Times.
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