Ecstasy used by the old man, bit of a looker? (8)
I believe the answer is:
eyepiece
'bit of a looker?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'ecstasy used by the old man' is the wordplay.
'ecstasy' becomes 'E' (informal term for the drug).
'used by' means one lot of letters go next to another.
'the old' becomes 'ye' (resembles a historical spelling of 'the').
'man' becomes 'piece' (synonyms).
'e'+'ye'+'piece'='EYEPIECE'
Can you help me to learn more?
(Other definitions for eyepiece that I've seen before include "Part of a microscope" , "Monocle" , "Given lens" , "that fits into socket" , "It enables us to view" .)