Perhaps some go round a number of ways (5)
I believe the answer is:
modes
'ways' is the definition.
('mode' can be a synonym of 'way')
'perhaps some go round a number' is the wordplay.
'perhaps' indicates an anagram.
'go round' means one lot of letters goes inside another.
'a number' becomes 'd' (D is an example**).
'some' anagrammed gives 'moes'.
'moes' placed around 'd' is 'MODES'.
'of' is the link.
(Other definitions for modes that I've seen before include "Styles of domes" , "Fashions" , "Ways - manners" , "Styles (in clothes, etc)" .)