The man needs 59 in spiral form (5)
I believe the answer is:
helix
'spiral form' is the definition.
'helix' can be an answer for 'form' (helix is a kind of form). I'm not sure about the 'spiral' bit.
'the man needs 59' is the wordplay.
'the man' becomes 'he' (he refers to a man).
'needs' means one lot of letters go next to another.
'59' becomes 'LIX' (roman numeral).
'he'+'lix'='HELIX'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for helix that I've seen before include "Spiral shape" , "A three-dimensional spiral" , "Screwed coil" , "Structure made up of a continuous series of loops" , "Intertwining with another" .)