Letters relevant to the situation? (4)
I believe the answer is:
post
'letters' is the definition.
(letters in the mail or post)
'relevant to the situation?' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
The remaining letters 'pos' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for post that I've seen before include "Send via the mail" , "Mail; wooden stake" , "Leave message online" , "ob" , "employment" .)