Cryptic crossword clue
Poor Kevin with nothing to call upon 6

The most common and most likely answer to this crossword clue is the 6 letter word INVOKE

I've seen this crossword clue in The Guardian
I
N
V
O
K
E

Buddy explains!

The straight part
We know that "to call upon" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to call upon = invoke.
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 INVOKE mean?

INVOKE verb
  1. To call upon (a person, a god) for help, assistance or guidance.
  2. To solicit, petition for, appeal to a favorable attitude.
  3. To call to mind (something) for some purpose.
  4. To appeal for validation to a (notably cited) authority.
  5. To conjure up with incantations.
  6. To bring about as an inevitable consequence.
  7. To cause (a program or subroutine) to execute.

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