A nut in front (5)

I believe the answer is:

ahead

'in front' is the definition.
(synonyms)

'a nut' is the wordplay.
'nut' becomes 'head' (nut can mean one's head).
'a'+'head'='AHEAD'

(Other definitions for ahead that I've seen before include "In the vanguard" , "In the future" , "at pole" , "In the lead, in advance" , "Forwards" .)

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