a bit of a...

a bit of a/an

1. Somewhat; rather; to some extent. He's a nice enough guy, but he's a bit of a dolt. There's just a bit of an issue with our Wi-Fi at the moment; it should be back on in a few minutes.
2. A very considerable amount or degree. It looks to be a bit of a mess for the prime minister. We'll need a bit of planning to pull off an event this big.
See also: bit, of
Farlex Dictionary of Idioms.

a bit of a...

(informal, especially British English) used when talking about unpleasant or negative things or ideas, to mean ‘rather a...’: We may have a bit of a problem on our hands. The rail strike is a bit of a pain.
See also: bit, of
Farlex Partner Idioms Dictionary
See also:
  • a bit of a/an
  • do (one's) bit
  • do bit
  • do one's bit
  • do your bit
  • too
  • shade
  • a shade
  • a shade (something)
  • bit by bit