Swallow rising over November landscape at last making dive (6)
I believe the answer is:
plunge
'dive' is the definition.
(I know that plunge is a type of dive)
'swallow rising over november landscape at last' is the wordplay.
'swallow' becomes 'gulp' (gulp is a kind of swallow).
'rising' is a reversal indicator (in a down clue, letters go up).
'over' is an insertion indicator.
'november' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'at last' suggests the final letters.
The final letter of 'landscape' is 'e'.
'gulp' reversed gives 'plug'.
'plug' enclosing 'n' is 'plung'.
'plung'+'e'='PLUNGE'
'making' is the link.
(Other definitions for plunge that I've seen before include "Dive or fall headlong" , "Fall suddenly and uncontrollably" , "land in water" , "Thrust into liquid" , "A steep drop" .)