That's right - I have to give a hand (5)
I believe the answer is:
ideal
'that's right' is the definition.
I can't tell whether this definition defines the answer.
'i have to give a hand' is the wordplay.
'have' is a charade indicator (letters next to each other).
'to give a hand' becomes 'deal' (I've seen this in another clue).
'i'+'deal'='IDEAL'
Can you help me to learn more?
(Other definitions for ideal that I've seen before include "Conceptual" , "Cutting/stabbing weapons" , "Dream" , "Best possible" , "Very eager (to see)" .)