God of ancient horticulture? (4)
I believe the answer is:
thor
'god' is the definition.
(Thor is an example)
'of ancient horticulture?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'THOR' can be found hidden inside 'ancient horticulture'.
(Other definitions for thor that I've seen before include "The Thunderer" , "Norse god of thunder - a weekday is named after him" , "Norse god wielding a hammer" , "Imitative artistic work" , "Norse god for whom Thursday is named" .)