Irritable, test son with questions (5-8)

'questions' is the definition.
I know nothing about this answer so I can't tell whether this works.

'irritable test son' is the wordplay.
I cannot quite see how this works, but
'irritable' could be 'cross' (I've seen this in another clue) and 'cross' is located in the answer.
'test' could be 'examine' (synonyms) and 'examine' is found within the answer.
'son' could be 's' (genealogical abbreviation for son) and 's' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'with' is the link.

Can you help me to learn more?