Lintels beginning to go for extortionate prices (7)
I believe the answer is:
ransoms
'extortionate prices' is the definition.
'lintels beginning to go' is the wordplay.
'lintels' becomes 'transoms' (both are a type of architectural structure).
'beginning to go' means to remove the first letter.
'transoms' with its initial letter removed is 'RANSOMS'.
'for' acts as a link.
I've seen this clue in The Telegraph.
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