Arrive at a striking idea? (3,2)
I believe the answer is:
hit on
'arrive' is the definition.
Both the definition and answer are verbs in their base form.
Perhaps there's a link between them I don't understand?
'at a striking idea?' is the wordplay.
I cannot quite see how this works, but
'at' could be 'on' (location) and 'on' is found in the answer.
'striking' could be 'hit' (synonyms) and 'hit' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for hit on that I've seen before include "Serendipitously find" , "Discover, think of" , "Try to get off with" , "Make advances to (US)" , "try a pass?" .)