Subtle suggestions in what could be seen as rude sonnet (10)

I believe the answer is:

undertones

'subtle suggestions' is the definition.

'what could be seen as rude sonnet' is the wordplay.
'what could be seen as' indicates an anagram.
'rude'+'sonnet'='rudesonnet'
'rudesonnet' with letters rearranged gives 'UNDERTONES'.

'in' is the link.

I've seen this clue in The Telegraph.

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