Crossword Genius

Part of cluster I left infertile (7)

Ross

I believe the answer is:

sterile

'infertile' is the definition.
('sterile' can be similar in meaning to 'infertile')

'part of cluster i left' is the wordplay.
'part of' indicates a hidden word.
'STERILE' is hidden in the letters of 'cluster i left'.

(Other definitions for sterile that I've seen before include "unable to reproduce results" , "Germ-free" , "Free from living micro-organisms, absolutely clean" , "Unable to produce young" , "Uninspired" .)

I've seen this clue in The Telegraph.
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