Head of department interrupting lad with employment involving shell of car (8)
I believe the answer is:
bodywork
'employment involving shell of car' is the definition.
I can't tell whether this defines the answer.
'head of department interrupting lad' is the wordplay.
'head' says to take the initial letters.
'interrupting' indicates putting letters inside.
'lad' becomes 'bywork' (I can't explain this - if you can you should believe this answer much more).
The initial letters of 'of department' is 'od'.
'od' inserted into 'bywork' is 'BODYWORK'.
'with' is the link.
Can you help me to learn more?
(Other definitions for bodywork that I've seen before include "External shell of vehicle" , "Outside of car" , "The case" , "Vehicle's outer shell" .)