Question

if I cut out coffee for the next two weeks, I could manage well enough identify and analyse the clause

Answer 1

it's an adverb clause

Answer 2

If the sentence is “If I cut out coffee for the next two weeks,

I could manage well enough”, it is a complex sentence and it is made of two clauses.

One is the principle clause and the other one is the subordinate clause.

The main (principle) clause is “I could manage well enough”.

The subordinate clause is “If I cut out coffee for the next two weeks”.