Boy gets old delivery (4)
I believe the answer is:
load
'delivery' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'boy gets old' is the wordplay.
'boy' becomes 'lad' (informal term for boy).
'gets' indicates putting letters inside (gets can mean captures or absorbs).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'lad' going around 'o' is 'LOAD'.
Can you help me to learn more?
(Other definitions for load that I've seen before include "Charge a gun" , "Goods carried by a large vehicle" , "Weight to be transported" , "Weigh down" , "Weight, source of pressure" .)