Crossword Genius

Part of speech opens with ambition (4)

Ross

I believe the answer is:

hope

'ambition' is the definition.
(thesaurus)

'part of speech opens with' is the wordplay.
'part of' indicates a hidden word.
'HOPE' is hidden within 'speech opens with'.

(Other definitions for hope that I've seen before include "Cross your fingers" , "It springs eternal, it's said" , "Feeling of optimism" , "Bob --, US comedian" , "English-born US comedian, d. 2003" .)

I've seen this clue in the Irish Times.
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