A very regular writer, skipping intro, may be a cagey type (8)

'a cagey type' is the definition.
(keeper of an aviary - a type of cage)

'a very regular writer skipping intro' is the wordplay.
'a very' becomes 'av' (I've seen this in other clues).
'regular writer' becomes 'diarist'.
'skipping intro' means to remove the first letter.
'diarist' with its initial letter taken off is 'iarist'.
'av'+'iarist'='AVIARIST'

'may be' acts as a link.