What does the cryptic crossword clue "Ask question of speller (5)" mean?

The definition is "speller". The wordplay uses a homophone (sounds like). Homophone (indicated by “ask” – not too sure about that..) of “which”. The third homophone in the puzzle The answer is WITCH.

Ask question of speller (5)

Guardian Cryptic #27212 | 12 Down | 2017-06-01 flower

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