German boy trying to lose weight? (6)
I believe the answer is:
dieter
'german boy' is the definition.
(I've seen this before)
'trying to lose weight?' is the wordplay.
'trying' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to' means one lot of letters go next to another (I've seen this in other clues).
'lose weight?' becomes 'diet' (I've seen this in another clue).
'er' put after 'diet' is 'DIETER'.
Can you help me to learn more?
(Other definitions for dieter that I've seen before include "One watching one's weight" , "The weight-watcher" , "who wants to lose 13 [BULK]" , "who's getting slimmer?" , "bloke obeying regime" .)