Lament-There are two 'Fors' in the first stanza. What are they?it is from stanza 1
I am assuming that you are referring to a poem by Gillian Clarke and not to other poems of this same name by Edna St. Vincent Millay or Dylan Thomas.
The Clarke poem does have "for" twice in its first stanza, both of them refer to the plight of a female turtle. The first refers directly to the turtle, who has a "pulsing burden" of eggs. She is trying to find a place to lay them. The second "for" refers to the eggs themselves. They are laid in some unhealthy place.
The point of this part of the poem is that the environment has been damaged to the point where the turtle has to lay her eggs in a "nest of sickness."