What does the cryptic crossword clue "Promote mushy peas to nurse (4)" mean?

The definition is "Promo". The wordplay uses a hidden word. HYPE ( hidden word in [to nurse] MUS HY PE AS) The answer is HYPE.

Promote mushy peas to nurse (4)

Independent Cryptic #11729 | 26 Down | 2024-05-14 flower