Refrain from TV? Seem agitated in skimpy undies (5,4)
I believe the answer is:
theme song
'refrain from tv?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?
'seem agitated in skimpy undies' is the wordplay.
'agitated' indicates anagramming the letters.
'in' indicates putting letters inside.
'skimpy undies' becomes 'thong' (I can't explain this - if you can you should give a lot more credence to this answer).
'seem' is an anagram of 'emes'.
'emes' inserted into 'thong' is 'THEME SONG'.
Can you help me to learn more?
(Other definitions for theme song that I've seen before include "Characteristic melody often repeated in musical" , "Signature tune" , "Give me Sunshine" .)