What does the cryptic crossword clue "That is found in side streets (2,3)" mean?

The definition is "That is". The wordplay uses a hidden word. ID EST ( hidden word in [found in] S IDE ST REETS) The answer is IDEST.

That is found in side streets (2,3)

Independent Cryptic #11964 | 11 Across | 2025-02-12 flower