Crossword Genius

Charles and Heather are obviously amused (9)

Ross

I believe the answer is:

chuckling

'obviously amused' is the definition.

'charles and heather' is the wordplay.
'charles' becomes 'chuck'.
'and' is a charade indicator (letters next to each other).
'heather' becomes 'ling' ('ling' can be a synonym of 'heather').
'chuck'+'ling'='CHUCKLING'

'are' is the link.

(Another definition for chuckling that I've seen is " laughing quietly".)

I've seen this clue in The Guardian.
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