have a clear head

have a clear head

To have a rational manner, often because one is not under the influence of alcohol or drugs. You need to have a clear head when you make a big decision like that.
See also: clear, have, head
Farlex Dictionary of Idioms.

have/keep a clear ˈhead

be able to think clearly, especially because you have not had any alcohol, drugs, etc: Don’t give me any wine, I must keep a clear head for the meeting this afternoon. OPPOSITE: a thick head
See also: clear, have, head, keep
Farlex Partner Idioms Dictionary
See also:
  • have/keep a clear head
  • keep a clear head
  • all manner of
  • all manner of somebody/something
  • lose touch with reality
  • lose touch with sanity
  • la
  • à la
  • in a manner of speaking
  • manner