Partner nods when moving communication device (11)

I believe the answer is:

transponder

I'm a little stuck... Click here to teach me more about this clue!

'communication device' is the definition.
'transponder' can be an answer for 'device' (transponder is a kind of device). I'm not sure about the 'communication' bit.

'partner nods when moving' is the wordplay.
'when moving' indicates an anagram (I've seen this in other clues).
'partner'+'nods'='partnernods'
'partnernods' anagrammed gives 'TRANSPONDER'.

Can you help me to learn more?

(Other definitions for transponder that I've seen before include "Aircraft's tracking device" , "Device carried by aircraft" , "Aircraft communication device" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.