Pick up heavy breathing on microphone, that’s shocking (7)
I believe the answer is:
seismic
'shocking' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?
'pick up heavy breathing on microphone' is the wordplay.
'pick up' says the letters should be written in reverse.
'heavy breathing' becomes 'sies' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' says to put letters next to each other.
'microphone' becomes 'mic'.
'sies' back-to-front is 'seis'.
'seis'+'mic'='SEISMIC'
'that's' is the link.
Can you help me to learn more?
(Other definitions for seismic that I've seen before include "of enormous proportions" , "Caused by an earthquake" , "Resulting from earthquakes" , "earth-shattering effects?" , "Of earth tremors" .)