It's a tight squeeze sticking listening device for initial handler into hidden microphone
I believe the answer is:
bear hug
'it's a tight squeeze' is the definition.
(I've seen this before)
'sticking listening device for initial handler into hidden microphone' is the wordplay.
'sticking listening device' becomes 'ear' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'for' says to put letters next to each other.
'initial' indicates taking the first letters.
'into' means one lot of letters goes inside another.
'hidden microphone' becomes 'bug' (I've seen this before).
The first letter of 'handler' is 'h'.
'ear'+'h'='earh'
'earh' placed inside 'bug' is 'BEAR HUG'.
Can you help me to learn more?
(Other definitions for bear hug that I've seen before include "tight squeeze" , "Huge bra (anag.)" , "Rough tight embrace" , "embrace that's painful?" , "Vigorous embrace" .)