Smells greeting females visiting empty wilderness (6)

'smells' is the definition.
(whiffing is a kind of smelling)

'greeting females visiting empty wilderness' is the wordplay.
'greeting' becomes 'hi' (hi is a kind of greeting).
'females' becomes 'ff' (an abbreviation for female written twice).
'visiting' is an insertion indicator.
'empty' means to remove the middle letters.
'wilderness' with its middle taken out is 'ws'.
'hi'+'ff'='hiff'
'hiff' put into 'ws' is 'WHIFFS'.