Very clear decision after taking drugs? (4-10)

I believe the answer is:

high-resolution

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

'very clear decision after taking drugs?' is the definition.
I can't tell whether this defines the answer.

'very clear decision' is the wordplay.
'very clear' becomes 'high' (I am not sure about this - if you are sure you should believe this answer much more).
'decision' becomes 'resolution' (I've seen this before).
'high'+'resolution'='HIGH-RESOLUTION'

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