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Popular line in board game is such a wonder (8)

Ross

I believe the answer is:

chinless

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'such a wonder' is the definition.
I can't tell whether this defines the answer.

'popular line in board game' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' means one lot of letters goes inside another.
'board game' becomes 'chess' (chess is a kind of board game).
'in'+'l'='inl'
'inl' put into 'chess' is 'CHINLESS'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for chinless that I've seen before include "Without outstanding feature" , "(Of a "wonder") looking feeble and indecisive" , "Like some Hooray Henries" , "Lacking strength of character" , "Lack of courage, being without mandible" .)

I've seen this clue in The Times.
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