Assembly code problem for Linux 64

Question

I created a code for GNU Asssembly 64-bit Linux very simple and it works. Only after strip it stops working. What may be occurring?

Beginning of the code

.section    .rodata

clear:
    .ascii "\033c\0"

size:
    .int . -clear       

.section    .text           
.globl _start           

_start:

_zera:

    xorq        %rax,   %rax
    xorq        %rdi,       %rdi
    xorq        %rsi,       %rsi
    xorq        %rdx,   %rdx

_apaga:

    movq    $1, %rax 
    movq    $1, %rdi
    movq    $clear, %rsi
    movq    size,   %rdx
    syscall

_fim:
    movq    $60,    %rax
    movq    $0,     %rdi
    syscall

Thanks in advance.