Titchy parent's bottom? (7)

I believe the answer is:

minimum

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'bottom?' is the definition.
(similar in meaning)

'titchy parent's' is the wordplay.
'titchy' becomes 'mini' (I am not sure about this - if you are sure you should believe this answer much more).
'parent' becomes 'mum' (mum is a kind of parent).
'mini'+'mum'='MINIMUM'

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(Other definitions for minimum that I've seen before include "The least of smallest amount possible" , "Bottom" , "Least recorded value" , "Lowest value" , "Least possible quantity" .)

I've seen this clue in The Telegraph.

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