Crossword Genius

Idiot — there’s just one H in “spheroid” (8)

Ross

I believe the answer is:

bonehead

'idiot' is the definition.
(both can mean a stupid person)

'just one h in spheroid' is the wordplay.
'just one' becomes 'one' (only one).
'in' is an insertion indicator.
'spheroid' becomes 'bead' (a bead of liquid).
'one'+'h'='oneh'
'oneh' inserted inside 'bead' is 'BONEHEAD'.

'there's' acts as a link.

(Other definitions for bonehead that I've seen before include "Stupid person (colloq.)" , "stupid leader" , "Stupid person with ossified cranium" , "Numbskull" , "Stupid person with ossified brain" .)

I've seen this clue in The Times.
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