What does the cryptic crossword clue "Singular little guy, bit of a pain (6)" mean?

The definition is "bit of a pain". The wordplay uses a charade (building blocks). S(singulare) + TITCH (Little guy) The answer is STITCH.

Singular little guy, bit of a pain (6)

Telegraph Cryptic #31208 | 23 Across | 2026-04-08 flower