What does the cryptic crossword clue "Stiff tongue that reveals your true feelings? (4,8)" mean?

The wordplay uses a charade (building blocks). BODY (synonym="stiff") + LANGUAGE (synonym="tongue") = BODYLANGUAGE The answer is BODYLANGUAGE.

Stiff tongue that reveals your true feelings? (4,8)

Guardian Cryptic #29646 | 20 Across | 2025-03-19 flower