Become rigid like the boss if you are unguarded (6)
I believe the answer is:
ossify
'become rigid' is the definition.
(I've seen this in another clue)
'the boss if you are unguarded' is the wordplay.
'OSSIFY' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.
'like' acts as a link.
Can you help me to learn more?
(Other definitions for ossify that I've seen before include "Change into bone, or become unprogressive" , "Become hard and bony with age" , "become hardened" , "Convert into bone" , "Solidify; turn into bone" .)