What does the cryptic crossword clue "Understudies accepting credit for theatre attire (6)" mean?

The wordplay uses a container (one word inside another). CR (synonym="credit") in SUBS (synonym="understudies") = SCRUBS The answer is SCRUBS.

Understudies accepting credit for theatre attire (6)

Guardian Cryptic #29198 | 22 Across | 2023-10-11 flower