What does the cryptic crossword clue "Go en masse to perform, sticking to the script (2,7)" mean?

The wordplay uses an anagram. anagram of GO (synonym="GO") + EN (synonym="EN") + MASSE (synonym="MASSE") = ONMESSAGE The answer is ONMESSAGE.

Go en masse to perform, sticking to the script (2,7)

Guardian Cryptic #29609 | 15 Down | 2025-02-04 flower