Sister eats turkey that is with more sauce (7)

I believe the answer is:

sassier

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'more sauce' is the definition.
The definition and answer are not the same part of speech.

'sister eats turkey that is' is the wordplay.
'sister' becomes 'sr' (I've seen this in other clues).
'eats' means one lot of letters goes inside another.
'turkey' becomes 'ass' (I've seen this before).
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'ass'+'ie'='assie'
'sr' placed around 'assie' is 'SASSIER'.

'with' acts as a link.

Can you help me to learn more?

(Another definition for sassier that I've seen is " More impudent".)

I've seen this clue in The Telegraph.

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