Sentimentally pretty daughter, initially youthful, resembling a hearty outdoor type (6)

I believe the answer is:

tweedy

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'resembling a hearty outdoor type' is the definition.
I can't tell whether this defines the answer.

'sentimentally pretty daughter initially youthful' is the wordplay.
'sentimentally pretty' becomes 'twee' (I've seen this before).
'daughter' becomes 'd' (genealogical abbreviation).
'initially' indicates taking the first letters.
The initial letter of 'youthful' is 'y'.
'twee'+'d'+'y'='TWEEDY'

Can you help me to learn more?

(Other definitions for tweedy that I've seen before include "Like a country gentleman" , "Countrified; like cloth" , "Like rough woollen cloth" , "outdoorsy?" , "dressing for the outdoor life?" .)

I've seen this clue in The Independent.

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