A bit old to be seeing someone? (5)
I believe the answer is:
dated
'a bit old' is the definition.
'dated' can be an answer for 'old' (thesaurus). I'm not sure about the 'a bit' bit.
'seeing someone?' is the wordplay.
I cannot quite see how this works, but
'someone?' could be 'date' (date is a kind of someone) and 'date' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'to be' is the link.
Can you help me to learn more?
(Other definitions for dated that I've seen before include "Revealed the age of" , "Rusty" , "Went out with - old hat" , "Walked out with" , "Obsolete" .)