John recited with some force, that's clear (5)
'clear' is the definition.
(similar in meaning)
'john recited with some force' is the wordplay.
I cannot quite see how this works, but
'force' could be 'cid' (abbreviation for Criminal Investigation Department) and 'cid' is found in the answer.
This explanation may well be incorrect...
'that's' is the link.
(Other definitions for lucid that I've seen before include "Transparent", "Thinking clearly", "Clear, sane", "Limpid", "Easily understood; sane".)