Crossword Genius

Is on terra firma for Easter say (6)

Ross

I believe the answer is:

island

'for easter say' is the definition.
(Easter Island is an example)

'is on terra firma' is the wordplay.
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'terra firma' becomes 'land' (synonyms).
'is'+'land'='ISLAND'

(Other definitions for island that I've seen before include "See 14" , "Eg, eyot or inch" , "Man perhaps" , "See 2" , "Malta, say" .)

I've seen this clue in The Sun.
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