Charlie secures head of screwdriver in screw (5)
I believe the answer is:
twist
'screw' is the definition.
(I've seen this before)
'charlie secures head of screwdriver' is the wordplay.
'charlie' becomes 'twit' (I can't justify this - if you can you should give a lot more credence to this answer).
'secures' means one lot of letters goes inside another.
'head of' indicates taking the first letters.
The first letter of 'screwdriver' is 's'.
'twit' placed around 's' is 'TWIST'.
'in' is the link.
Can you help me to learn more?
(Other definitions for twist that I've seen before include "dance from the 60s" , "1960s' dance craze" , "Twirl" , "surprising plot development" , "Convolute" .)