Green seas generated enthusiasm (9)

I believe the answer is:

eagerness

'enthusiasm' is the definition.
(eagerness is a kind of enthusiasm)

'green seas generated' is the wordplay.
'generated' is an anagram indicator.
'green'+'seas'='greenseas'
'greenseas' with letters rearranged gives 'EAGERNESS'.

(Other definitions for eagerness that I've seen before include "Avidity" , "Keen attitude" , "Keenness, enthusiasm" , "Sense rage (anag.)" , "Keen interest" .)

I've seen this clue in The Times.

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