Screw, perhaps, wrapping hands around lag's midriff (6)
I believe the answer is:
salary
'screw' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'perhaps wrapping hands around lag's midriff' is the wordplay.
'perhaps' becomes 'say' (both can mean 'for example').
'wrapping' indicates putting letters inside.
'hands' becomes 'palms'.
'around' means to look at the middle letters.
'lag's midriff' becomes 'ar' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The central letter of 'palms' is 'l'.
'l'+'ar'='lar'
'say' going around 'lar' is 'SALARY'.
Can you help me to learn more?
(Other definitions for salary that I've seen before include "Remuneration, earnings" , "Regular income from employment" , "Regular monthly wage" , "Annual pay" , "Fixed regular payment of work" .)