I spy spies regularly on telly, naked ... (8)
I believe the answer is:
ellipsis
'i spy spies regularly on telly naked' is the definition.
I can't judge whether this defines the answer.
'i spy spies regularly on telly naked' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'on' is a charade indicator (letters next to each other).
'naked' says to take the centre (outside letters removed so centre is unclothed).
The central letters of 'telly' are 'ell'.
'spy'+'spies'='spyspies'
The alternate letters of 'spyspies' are 'psis'.
'i'+'psis'='ipsis'
'ipsis' put after 'ell' is 'ELLIPSIS'.
Can you help me to learn more?
(Other definitions for ellipsis that I've seen before include "Omission of parts of words or sentences" , "dotty marking" , "Omission of words from speech or writing" , "dotty row" , "Omission of words (gram.)" .)