Mug up on grammar — potty, potty (5)
I believe the answer is:
typto
'mug up on grammar' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'potty potty' is the wordplay.
'potty' is an anagram indicator.
'potty' anagrammed gives 'TYPTO'.
Can you help me to learn more?
I've seen this clue in The Times.
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