Look at what HGV driver might do with old fellow! (3,1,4,2)

'look at' is the definition.
(to get a load of something is to look at it)

'hgv driver might do with old fellow' is the wordplay.
I cannot really see how this works, but
'do' is present in the answer.
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is located in the answer.
'fellow' could be 'al' (I've seen this in other clues) and 'al' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'what' is the link.

Can you help me to learn more?