Cryptic crossword clue
All-round diet includes source of protein – not enthusiastic! 5

The most common and most likely answer to this crossword clue is the 5 letter word TEPID

I've seen this crossword clue in The Daily Telegraph
T
E
P
I
D


Buddy explains!

The straight part
We know that "not enthusiastic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not enthusiastic = tepid.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does TEPID mean?

TEPID adjective
  1. Lukewarm; neither warm nor cool.
  2. Uninterested; exhibiting little passion or eagerness.

Latest crossword clues with full explanations