One may grow up a little bit camp at first (10)
I believe the answer is:
stalagmite
'one may grow up a' is the definition.
I can't tell whether this defines the answer.
'little bit camp at first' is the wordplay.
'little bit' becomes 'mite'.
'camp' becomes 'stalag' (I've seen this before**).
'at first' means one lot of letters go next to another.
'mite' after 'stalag' is 'STALAGMITE'.
Can you help me to learn more?
(Other definitions for stalagmite that I've seen before include "One that grows up" , "Column made by dripping water" , "Upward-rising cave deposit" , "Pillar of the underground" , "Effect of dripping" .)