What does the cryptic crossword clue "Starmer's struggling to produce bits of (8)" mean?

The wordplay uses an anagram. anagram of STARMERS ("Starmer's") [anagram: "struggling"] = ARMRESTS The answer is ARMRESTS.

Starmer's struggling to produce bits of (8)

Independent Cryptic #11619 | 28 Across | 2024-01-06 flower