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Royal rejecting second son, which may be pedestrian (7)

Ross

I believe the answer is:

carless

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'may be pedestrian' is the definition.
The definition suggests a singular noun which matches the answer.

'royal rejecting second son' is the wordplay.
'royal' becomes 'carl' (I can't explain this - if you can you should give a lot more credence to this answer).
'rejecting second' becomes 'e' (and letter of 'rejecting').
'son' becomes 'ss' (I've seen this in other clues).
'carl'+'e'+'ss'='CARLESS'

'which' acts as a link.

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