Crossword Genius

For instance had penetrating light? (5)

Ross

I believe the answer is:

lased

I'm a little stuck... Click here to teach me more about this clue!

'penetrating light?' is the definition.
The definition suggests a verb in its base form which matches the answer.

'for instance had' is the wordplay.
'for instance' becomes 'lase' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'had' becomes 'd' (in contractions e.g. 'I'd', 'you'd' etc).
'lase'+'d'='LASED'

Can you help me to learn more?

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app