Crossword Genius

A grim son, weird life form! (8)

Ross

I believe the answer is:

organism

'life form' is the definition.
('organism' can be a synonym of 'life form')

'a grim son weird' is the wordplay.
'weird' indicates anagramming the letters.
'a'+'grim'+'son'='agrimson'
'agrimson' anagrammed gives 'ORGANISM'.

(Other definitions for organism that I've seen before include "Individual life form" , "individual creation" , "Any living entity" , "Body - cell - Mao grins (anag)" , "Something alive" .)

I've seen this clue in The Telegraph.
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