Crossword Genius

Part of Royal Society in addition (4)

Ross

I believe the answer is:

also

'in addition' is the definition.
(synonyms)

'part of royal society' is the wordplay.
'part of' indicates a hidden word.
'ALSO' can be found hidden inside 'royal society'.

(Other definitions for also that I've seen before include "Old" , "What's more" , "Plus" , "in accompaniment" , "revolutionary a part for Yugoslavia" .)

I've seen this clue in The Times.
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