Missionary position lost in the clutches of gorilla (7)
I believe the answer is:
apostle
'missionary' is the definition.
(I've seen this before)
'position lost in the clutches of gorilla' is the wordplay.
'position' becomes 'post' (synonyms).
'lost in' indicates putting letters inside.
'the clutches of gorilla' becomes 'ale' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'post' put inside 'ale' is 'APOSTLE'.
Can you help me to learn more?
(Other definitions for apostle that I've seen before include "who can handle a spoon?" , "Maybe Peter" , "Vigorous supporter" , "Missionary or evangelist" , "Follower of Christ" .)