Complain to head worker about door mechanism (6)
I believe the answer is:
whinge
'complain' is the definition.
(I've seen this before)
'head worker about door mechanism' is the wordplay.
'head' suggests taking the first letters.
'about door mechanism' becomes 'hinge' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'worker' is 'w'.
'w'+'hinge'='WHINGE'
'to' is the link.
Can you help me to learn more?
(Other definitions for whinge that I've seen before include "Moan" , "Grumble or complain persistently" , "Peevish complaint" , "Complain annoyingly" , "Complain, whine" .)