Using muscle contraction, it picks me up after regular mission (8)
I believe the answer is:
isotonic
'using muscle contraction it picks me' is the definition.
I can't tell whether this defines the answer.
'up after regular mission' is the wordplay.
'up' becomes 'tonic' (I am not sure about this - if you are sure you should believe this answer much more).
'after' is a charade indicator (letters next to each other).
'regular' indicates alternate letters.
The alternate letters of 'mission' are 'iso'.
'tonic' after 'iso' is 'ISOTONIC'.
Can you help me to learn more?
(Other definitions for isotonic that I've seen before include "(Of a drink) having the same concentrations of salts and minerals as in the body" , "Having the same tension" , "equally tense" , "at the same pressure?" , "Type of drink restoring body fluids and salts" .)