Cryptic crossword clue
Grandfather may be an old one

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

I've seen this crossword clue in The Guardian
T
I
M
E
R


Buddy explains!

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 TIMER mean?

TIMER noun
  1. Someone or something which times.
  2. A device used to measure amounts of time.
  3. Any electronic function that causes a device to be able to do something automatically after a preset amount of time.

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